
Since when does an old man make sense to a younger man?
Only when taken seriously... or taken on a short car trip around the block...
When you arrive back home, you might convince him he just got back from a long vacation...
If you take him seriously, there is wealth and one may learn a little to share when he's old.
For an old man, sharing is like pure gold... a worthy purpose to live. 
PS... When I was a young whipper-snapper... I knew everything... Now I know how little I know...